Lead-193

Properties and data of the isotope ¹⁹³Pb.

Content

General data

Name of the isotope:Lead-193; Pb-193Symbol:¹⁹³Pb or 19382PbMass number A:193 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:111Isotopic mass:192.97617(5) u (atomic weight of Lead-193)Nuclide mass:192.9311916 u (calculated nuclear mass without electrons)Mass excess:-22.1975 MeVMass defect:1.6272883 u (per nucleus)Nuclear binding energy:1515.80928772 MeV (per nucleus)
7.85393413 MeV (average binding energy per nucleon)Separation energy:S_N = 7.71(5) MeV (first neutron)
S_P = 3.61(6) MeV (first proton)Half-life:5~ minDecay constant λ:0.0023104906018665 s^-1Specific activity α:7.246927010416 × 10⁺¹⁸ Bq g^-1
195862892.17342 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Charge radius:5.4310(23) femtometer fmYear of discovery:1974

Radioactive Decay

Half-life T_½ = 5~ min (minutes) respectively 3 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹⁹³Tl	?	5.28(5) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁹³Bi, ¹⁹⁷Po.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^193m1Pb	+x keV	5.8(2) min	(13/2+)
^193m2Pb	2612.5(5) keV	180(15) ns	(33/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 193) with Lead-193. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 111	Isobar A = 193
70	¹⁸¹Yb
71	¹⁸²Lu
72	¹⁸³Hf
73	¹⁸⁴Ta	¹⁹³Ta
74	¹⁸⁵W	¹⁹³W
75	¹⁸⁶Re	¹⁹³Re
76	¹⁸⁷Os	¹⁹³Os
77	¹⁸⁸Ir	¹⁹³Ir
78	¹⁸⁹Pt	¹⁹³Pt
79	¹⁹⁰Au	¹⁹³Au
80	¹⁹¹Hg	¹⁹³Hg
81	¹⁹²Tl	¹⁹³Tl
82	¹⁹³Pb	¹⁹³Pb
83	¹⁹⁴Bi	¹⁹³Bi
84	¹⁹⁵Po	¹⁹³Po
85	¹⁹⁶At	¹⁹³At
86	¹⁹⁷Rn	¹⁹³Rn